dev-cpp-users

[Dev-C++] passing the content of a string to a variable from

[jose i. c. <ji...@fr...>]

Greetings O SmartOnes!

I have the following c code:

char FileContent(char *file)
{
    char fcontent(3000);
    ...
    /*in here I grab the content of a text file */
    ...
    return(fcontent);
}

int main(int argc, char *argv[])
{
    char text[3000];
    ...
    ...
    ...
    text = FileContent("temp.txt");
}

I can't get this to work.  I've a bunch of places and I even tried to get
the pointers to no avail.  I am new to c, but I am an expert programmer.
Any c help will be greatly appreciated.

thanks.

josé

RES: [Dev-C++] passing the content of a string to a variable from

[Daniel K. O. <dan...@ya...>]

A good start is to learn the C sintax.
Try this tutorial:
http://www.geocities.com/tom_torfs/cintro.html
(the best C-quick-tutorial I've ever seen)






Daniel K. O.


Only ask questions with yes/no answers if you want "yes" or "no" as the
answer.
http://homepages.tesco.net/~J.deBoynePollard/FGA/questions-with-yes-or-no-an
swers.html







 >  -----Mensagem original-----
 >  De: dev...@li...
 >  [mailto:dev...@li...]Em nome de jose isaias
 >  cabrera
 >  Enviada em: terça-feira, 8 de abril de 2003 22:52
 >  Para: dev...@li...
 >  Assunto: [Dev-C++] passing the content of a string to a variable from
 >
 >
 >
 >  Greetings O SmartOnes!
 >
 >  I have the following c code:
 >
 >  char FileContent(char *file)
 >  {
 >      char fcontent(3000);
 >      ...
 >      /*in here I grab the content of a text file */
 >      ...
 >      return(fcontent);
 >  }
 >
 >  int main(int argc, char *argv[])
 >  {
 >      char text[3000];
 >      ...
 >      ...
 >      ...
 >      text = FileContent("temp.txt");
 >  }
 >
 >  I can't get this to work.  I've a bunch of places and I even
 >  tried to get
 >  the pointers to no avail.  I am new to c, but I am an expert programmer.
 >  Any c help will be greatly appreciated.
 >
 >  thanks.
 >
 >  josé
 >

RE: [Dev-C++] passing the content of a string to a variable from

[Ioannis V. <iv...@at...>]

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of jose isaias cabrera
> Sent: Wednesday, April 09, 2003 4:52 AM
> To: dev...@li...
> Subject: [Dev-C++] passing the content of a string to a variable from
> 
> 
> 
> Greetings O SmartOnes!
> 
> I have the following c code:
> 
> char FileContent(char *file)
> {
>     char fcontent(3000);
>     ...
>     /*in here I grab the content of a text file */
>     ...
>     return(fcontent);
> }


I assume C:



> 
> int main(int argc, char *argv[])
> {
>     char text[3000];
>     ...
>     ...
>     ...
>     text = FileContent("temp.txt");



FileContent returns a char. You assign it to an array which is not proper.
If you intend it to return a char, you have to do something like:

text[0]=FileContent("temp.txt");


If you made a mistake and intend to return a char * you have either to do:


char *text;

/* ... */

text=FileContent("temp.txt");


or 


char text[3000];
char *p;

/* ... */

p=FileContent("temp.txt");

strncpy(text, p, 3000);

text[2999]='\0';




> }
> 
> I can't get this to work.  I've a bunch of places and I even 
> tried to get
> the pointers to no avail.  I am new to c, but I am an expert 
> programmer.
> Any c help will be greatly appreciated.





Ioannis Vranos
 
* Programming pages: http://www.noicys.freeurl.com
* Alternative URL 1: http://run.to/noicys
* Alternative URL 2: http://www.noicys.cjb.net


Anti-racism movement: http://www.positive-youthfoundation.org
Iraq Peace Pledge: http://www.peacepledge.org

RE: [Dev-C++] passing the content of a string to a variable from

[Per W. <pw...@ia...>]

See below.

/Per W

On Wed, 9 Apr 2003, Ioannis Vranos wrote:

> > -----Original Message-----
> > From: dev...@li...
> > [mailto:dev...@li...] On Behalf
> > Of jose isaias cabrera
> > Sent: Wednesday, April 09, 2003 4:52 AM
> > To: dev...@li...
> > Subject: [Dev-C++] passing the content of a string to a variable from
> >
> >
> >
> > Greetings O SmartOnes!
> >
> > I have the following c code:
> >
> > char FileContent(char *file)

// Need to return a pointer to text, not just a single character.
char* FileContent(char *file)

> > {
> >     char fcontent(3000);

// Array size should be in []
// You may never return address of a variable declared on stack.
// As soon as the FileContent() returns, the fcontent buffer would
// be deleted unless it's declared static, which will store
// fcontent as a global variable but only available within name
// space of FileContent().
static char fcontent[3000];

> >     ...
> >     /*in here I grab the content of a text file */
> >     ...
> >     return(fcontent);
> > }
>
>
> I assume C:
>
>
>
> >
> > int main(int argc, char *argv[])
> > {
> >     char text[3000];

// If FileContent already keeps the full text content, no need for one
// more buffer. Just keep track of a pointer to the text.
// Besides, it isn't possible to assign an array to an array. As Ioannis
// shows below, if you really wants to copy the contents of an array to
// another array, you have to call strcpy(), strncpy(), memcpy(),
// memmove() or similar.
//      char *text;

> >     ...
> >     ...
> >     ...
> >     text = FileContent("temp.txt");
>
>
>
> FileContent returns a char. You assign it to an array which is not proper.
> If you intend it to return a char, you have to do something like:
>
> text[0]=FileContent("temp.txt");
>
>
> If you made a mistake and intend to return a char * you have either to do:
>
>
> char *text;
>
> /* ... */
>
> text=FileContent("temp.txt");
>
>
> or
>
>
> char text[3000];
> char *p;
>
> /* ... */
>
> p=FileContent("temp.txt");
>
> strncpy(text, p, 3000);
>
> text[2999]='\0';
>
>
>
>
> > }
> >
> > I can't get this to work.  I've a bunch of places and I even
> > tried to get
> > the pointers to no avail.  I am new to c, but I am an expert
> > programmer.
> > Any c help will be greatly appreciated.
>
>
>
>
>
> Ioannis Vranos
>
> * Programming pages: http://www.noicys.freeurl.com
> * Alternative URL 1: http://run.to/noicys
> * Alternative URL 2: http://www.noicys.cjb.net
>
>
> Anti-racism movement: http://www.positive-youthfoundation.org
> Iraq Peace Pledge: http://www.peacepledge.org
>
>
>
>
>
> -------------------------------------------------------
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>

RE: [Dev-C++] passing the content of a string to a variable from

[Ioannis V. <iv...@at...>]

> -----Original Message-----
> From: Per Westermark [mailto:pw...@ia...] 
> Sent: Wednesday, April 09, 2003 10:02 AM
> To: Ioannis Vranos
> Cc: Dev-C++ Mailing List
> Subject: RE: [Dev-C++] passing the content of a string to a 
> variable from
> 
> 
> See below.
> 
> /Per W
> 
> On Wed, 9 Apr 2003, Ioannis Vranos wrote:
> 
> > > -----Original Message-----
> > > From: dev...@li...
> > > [mailto:dev...@li...] On Behalf
> > > Of jose isaias cabrera
> > > Sent: Wednesday, April 09, 2003 4:52 AM
> > > To: dev...@li...
> > > Subject: [Dev-C++] passing the content of a string to a 
> variable from
> > >
> > >
> > >
> > > Greetings O SmartOnes!
> > >
> > > I have the following c code:
> > >
> > > char FileContent(char *file)
> 
> // Need to return a pointer to text, not just a single character.
> char* FileContent(char *file)



Just for accuracy, Ioannis Vranos had not written the above.


> 
> > > {
> > >     char fcontent(3000);
> 
> // Array size should be in []
> // You may never return address of a variable declared on stack.
> // As soon as the FileContent() returns, the fcontent buffer would
> // be deleted unless it's declared static, which will store
> // fcontent as a global variable but only available within name
> // space of FileContent().
> static char fcontent[3000];



The same apply for your comments here.

:)




Ioannis Vranos
 
* Programming pages: http://www.noicys.freeurl.com
* Alternative URL 1: http://run.to/noicys
* Alternative URL 2: http://www.noicys.cjb.net


Anti-racism movement: http://www.positive-youthfoundation.org
Iraq Peace Pledge: http://www.peacepledge.org

Re: [Dev-C++] passing the content of a string to a variable from

[jose i. c. <ji...@fr...>]

Per,

> // Need to return a pointer to text, not just a single character.
> char* FileContent(char *file)

this worked!  Thanks!  I had the code correct, but I was returning a string
instead of a string pointer.

thanks,

jose

RE: [Dev-C++] passing the content of a string to a variable from

[Ioannis V. <iv...@at...>]

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of jose isaias cabrera
> Sent: Thursday, April 10, 2003 4:21 AM
> To: Per Westermark; Ioannis Vranos
> Cc: Dev-C++ Mailing List
> Subject: Re: [Dev-C++] passing the content of a string to a 
> variable from
> 
> 
> 
> Per,
> 
> > // Need to return a pointer to text, not just a single character.
> > char* FileContent(char *file)
> 
> this worked!  Thanks!  I had the code correct, but I was 
> returning a string
> instead of a string pointer.



For accuracy you were returning a char.




Ioannis Vranos
 
* Programming pages: http://www.noicys.freeurl.com
* Alternative URL 1: http://run.to/noicys
* Alternative URL 2: http://www.noicys.cjb.net


Anti-racism movement: http://www.positive-youthfoundation.org
Iraq Peace Pledge: http://www.peacepledge.org

Re: [Dev-C++] passing the content of a string to a variable from

[jose i. c. <ji...@fr...>]

Yes I was...

Thanks Ioannis.

thanks.
> > Per,
> > 
> > > // Need to return a pointer to text, not just a single character.
> > > char* FileContent(char *file)
> > 
> > this worked!  Thanks!  I had the code correct, but I was 
> > returning a string
> > instead of a string pointer.
> 
> 
> 
> For accuracy you were returning a char.

Re: [Dev-C++] passing the content of a string to a variable from

[David M. <dem...@uw...>]

Looks like what you actually want is something like this:

char *FileContent(file *fp)
{
  char *buf;
  // Open the file...
  int i =3D fseek(fp, SEEK_END) + 1;
  buf =3D malloc(sizeof(i));
  fseek(fp, SEEK_SET);
  for(char ch =3D fgetc(fp); ch !=3D EOF; buf++ =3D ch);
  return buf;
}

I think this should work at least.  The code is off the top of my head and
untested.

At 09:51 PM 08/04/2003 -0400, jose isaias cabrera wrote:
>
>Greetings O SmartOnes!
>
>I have the following c code:
>
>char FileContent(char *file)
>{
>    char fcontent(3000);
>    ...
>    /*in here I grab the content of a text file */
>    ...
>    return(fcontent);
>}
>
>int main(int argc, char *argv[])
>{
>    char text[3000];
>    ...
>    ...
>    ...
>    text =3D FileContent("temp.txt");
>}
>
>I can't get this to work.  I've a bunch of places and I even tried to get
>the pointers to no avail.  I am new to c, but I am an expert programmer.
>Any c help will be greatly appreciated.
>
>thanks.
>
>jos=E9
>
>
>
>
>-------------------------------------------------------
>This SF.net email is sponsored by: ValueWeb:=20
>Dedicated Hosting for just $79/mo with 500 GB of bandwidth!=20
>No other company gives more support or power for your dedicated server
>http://click.atdmt.com/AFF/go/sdnxxaff00300020aff/direct/01/
>_______________________________________________
>Dev-cpp-users mailing list
>Dev...@li...
>TO UNSUBSCRIBE: http://www.noicys.cjb.net/devcpp/ub.htm
>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>

Re: [Dev-C++] passing the content of a string to a variable from

[Per W. <pw...@ia...>]

See below:

/Per W

On Wed, 9 Apr 2003, David Matthews wrote:

> Looks like what you actually want is something like this:
>
> char *FileContent(file *fp)
> {
>   char *buf;
>   // Open the file...
>   int i =3D fseek(fp, SEEK_END) + 1;

// Note - will return incorrect size for IS with end-of-line translation.
// cr+lf -> lf. However, not too big a problem unless large file with lot
// of short lines.
i =3D fseek(fp,0,SEEK_END)+1;

>   buf =3D malloc(sizeof(i));
>   fseek(fp, SEEK_SET);

fseek(fp,0,SEEK_SET);

>   for(char ch =3D fgetc(fp); ch !=3D EOF; buf++ =3D ch);

// No use to do fgetc() in pre-loop part, since then only one
// character will be read, followed by a wild loop.
// Also, need *buf++ for post-assign.
for (char ch; (ch =3D fgetc(fp)) !=3D EOF; *buf++ =3D ch);

// Have to zero-terminate since calloc() wasn't used.
*buf =3D '\0'';

// One alternative that is a bit quicker:
size_t count =3D fread(buf,1,i-1,fp);
if (count =3D=3D i)
    buf[count] =3D '\0';
else
    buf[0] =3D '\0';

>   return buf;
> }
>
> I think this should work at least.  The code is off the top of my head an=
d
> untested.
>
> At 09:51 PM 08/04/2003 -0400, jose isaias cabrera wrote:
> >
> >Greetings O SmartOnes!
> >
> >I have the following c code:
> >
> >char FileContent(char *file)
> >{
> >    char fcontent(3000);
> >    ...
> >    /*in here I grab the content of a text file */
> >    ...
> >    return(fcontent);
> >}
> >
> >int main(int argc, char *argv[])
> >{
> >    char text[3000];
> >    ...
> >    ...
> >    ...
> >    text =3D FileContent("temp.txt");
> >}
> >
> >I can't get this to work.  I've a bunch of places and I even tried to ge=
t
> >the pointers to no avail.  I am new to c, but I am an expert programmer.
> >Any c help will be greatly appreciated.
> >
> >thanks.
> >
> >jos=E9
> >
> >
> >
> >
> >-------------------------------------------------------
> >This SF.net email is sponsored by: ValueWeb:
> >Dedicated Hosting for just $79/mo with 500 GB of bandwidth!
> >No other company gives more support or power for your dedicated server
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> >Dev...@li...
> >TO UNSUBSCRIBE: http://www.noicys.cjb.net/devcpp/ub.htm
> >https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
> >
>
>
> -------------------------------------------------------
> This SF.net email is sponsored by: Etnus, makers of TotalView, The debugg=
er
> for complex code. Debugging C/C++ programs can leave you feeling lost and
> disoriented. TotalView can help you find your way. Available on major UNI=
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>

Re: [Dev-C++] passing the content of a string to a variable from

[David M. <dem...@uw...>]

Gahh, stupid stupid.

At 09:27 AM 09/04/2003 -0400, David Matthews wrote:
>Looks like what you actually want is something like this:
>
>char *FileContent(file *fp)
>{
>  char *buf;
>  // Open the file...
>  int i =3D fseek(fp, SEEK_END) + 1;
>  buf =3D malloc(sizeof(i));

Should be malloc(i); instead :\

>  fseek(fp, SEEK_SET);
>  for(char ch =3D fgetc(fp); ch !=3D EOF; buf++ =3D ch);
>  return buf;
>}
>
>I think this should work at least.  The code is off the top of my head and
>untested.
>
>At 09:51 PM 08/04/2003 -0400, jose isaias cabrera wrote:
>>
>>Greetings O SmartOnes!
>>
>>I have the following c code:
>>
>>char FileContent(char *file)
>>{
>>    char fcontent(3000);
>>    ...
>>    /*in here I grab the content of a text file */
>>    ...
>>    return(fcontent);
>>}
>>
>>int main(int argc, char *argv[])
>>{
>>    char text[3000];
>>    ...
>>    ...
>>    ...
>>    text =3D FileContent("temp.txt");
>>}
>>
>>I can't get this to work.  I've a bunch of places and I even tried to get
>>the pointers to no avail.  I am new to c, but I am an expert programmer.
>>Any c help will be greatly appreciated.
>>
>>thanks.
>>
>>jos=E9
>>
>>
>>
>>
>>-------------------------------------------------------
>>This SF.net email is sponsored by: ValueWeb:=20
>>Dedicated Hosting for just $79/mo with 500 GB of bandwidth!=20
>>No other company gives more support or power for your dedicated server
>>http://click.atdmt.com/AFF/go/sdnxxaff00300020aff/direct/01/
>>_______________________________________________
>>Dev-cpp-users mailing list
>>Dev...@li...
>>TO UNSUBSCRIBE: http://www.noicys.cjb.net/devcpp/ub.htm
>>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>>
>
>
>-------------------------------------------------------
>This SF.net email is sponsored by: Etnus, makers of TotalView, The debugger=
=20
>for complex code. Debugging C/C++ programs can leave you feeling lost and=
=20
>disoriented. TotalView can help you find your way. Available on major UNIX=
=20
>and Linux platforms. Try it free. www.etnus.com
>_______________________________________________
>Dev-cpp-users mailing list
>Dev...@li...
>TO UNSUBSCRIBE: http://www.noicys.cjb.net/devcpp/ub.htm
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Re: [Dev-C++] passing the content of a string to a variable from

[jose i. c. <ji...@fr...>]

Yep.  I had the other stuff, but was missing the char *FileContent....

thanks,

jose

----- Original Message -----
From: "David Matthews" <dem...@uw...>
To: "jose isaias cabrera" <ji...@fr...>;
<dev...@li...>
Sent: Wednesday, April 09, 2003 9:27 AM
Subject: Re: [Dev-C++] passing the content of a string to a variable from


Looks like what you actually want is something like this:

char *FileContent(file *fp)
{
  char *buf;
  // Open the file...
  int i = fseek(fp, SEEK_END) + 1;
  buf = malloc(sizeof(i));
  fseek(fp, SEEK_SET);
  for(char ch = fgetc(fp); ch != EOF; buf++ = ch);
  return buf;
}

I think this should work at least.  The code is off the top of my head and
untested.

At 09:51 PM 08/04/2003 -0400, jose isaias cabrera wrote:
>
>Greetings O SmartOnes!
>
>I have the following c code:
>
>char FileContent(char *file)
>{
>    char fcontent(3000);
>    ...
>    /*in here I grab the content of a text file */
>    ...
>    return(fcontent);
>}
>
>int main(int argc, char *argv[])
>{
>    char text[3000];
>    ...
>    ...
>    ...
>    text = FileContent("temp.txt");
>}
>
>I can't get this to work.  I've a bunch of places and I even tried to get
>the pointers to no avail.  I am new to c, but I am an expert programmer.
>Any c help will be greatly appreciated.
>
>thanks.
>
>josé
>
>
>
>
>-------------------------------------------------------
>This SF.net email is sponsored by: ValueWeb:
>Dedicated Hosting for just $79/mo with 500 GB of bandwidth!
>No other company gives more support or power for your dedicated server
>http://click.atdmt.com/AFF/go/sdnxxaff00300020aff/direct/01/
>_______________________________________________
>Dev-cpp-users mailing list
>Dev...@li...
>TO UNSUBSCRIBE: http://www.noicys.cjb.net/devcpp/ub.htm
>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>